package Expe11;

/**
 * @Author 28021
 * @Date 2022/11/22
 */
public class China implements Computable{
    int number;
    public int f (int x){
        int sum=0;
        for (int i = 0; i < x; i++) {
            sum +=i;
        }
        return sum;
    }
}
